Read the passage carefully, then choose the best answer for each question.
WHO WAS SACAGAWEA?
There are more statues of her than of any other American woman. Her face is on a U.S. coin. Clearly, she was an important person. But what do we know about the real Sacagawea?
Sacagawea was part of a Native American tribe called the Shoshone. At the age of 13, she was taken away by people from the Hidatsa tribe. She was living among the Hidatsa when Meriwether Lewis and William Clark met her in 1804.
Meriwether Lewis and William Clark were mapmakers. These pioneers were exploring the western part of the U.S. Because Sacagawea spoke two different Native American languages, they asked her to travel with them, along with her husband and baby son.
Sacagawea became an important part of the group and helped the explorers in many ways. For example, on May 14, 1805, a strong storm tipped over  one of their boats. Sacagawea stayed calm. She acted quickly and was able to save many of the maps and other things from the water. Her actions saved important knowledge from being lost.
As they traveled, Sacagawea helped Lewis and Clark talk to the Native American people in each village they visited. She helped the explorers make friends among the Native Americans, so they could trade with them. She also helped Lewis and Clark find a way across the mountains to the Pacific Ocean, and helped them find food on the way.
Sacagawea died when she was about 25. Sadly, we don't know much more about this amazing woman. But two hundred years later, she is remembered as an important woman in U.S. history.
Which of these sentences about Sacagawea is NOT true?
A.She took her child with her on the trip.
B.She asked Lewis and Clark if she could come on the trip.
C.She started living with the Hidatsa tribe when she was 13 years old.
D.Sacagawea helped Lewis and Clark in many ways.

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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions from 35 to 42.
What unusual or unique biological train led to the remarkable diversification and unchallenged success of the ants for over 50 million years? The answer appears to be that they were the first group of predatory eusocial insects that both lived and foraged primarily in the soil and in rotting vegetation on the ground. Eusocial refers to a form of insect society characterized by specialization of tasks and cooperative care of the young; it is rare among insects. Richly organized colonies of the land made possible by eusociality enjoy several key advantages over solitary individuals.
Under most circumstances groups of workers are better able to forage for food and defend the nest, because they can switch from individual to group response and back again swiftly and according to need. When a food object or nest intruder is too large for one individual to handle, nestmates can be quickly assembled by alarm or recruitment signals. Equally important is the fact that the execution of multiple-step tasks is accomplished in a series-parallelsequence. That is, individual ants can specialize in particular steps, moving from one object (such as a larva to be fed) to another (a second larva to be fed). They do not need to carry each task to completion from start to finish - for example, to check the larva first, then collect the food, then feed the larva. Hence, if each link in the chain has many workers in attendance, a sense directed at any particular object is less likely to fail. Moreover, ants specializing in particular labor categories typically constitute a caste specialized by age or body form or both. There has been some documentation of the superiority in performance and net energetic yield of various castes for their modal tasks, although careful experimental studies are still relatively few.
What makes ants unusual in the company of eusocial insects is the fact that they are the only eusocial predators(predators are animals that capture and feed on other animals) occupying the soil and ground litter. The eusocial termites live in the same places as ants and also have wingless workers, but they feed almost exclusively on dead vegetation.
(Source: TOEFL Reading)
All of the following terms are defined in the passage EXCEPT ______ .
A.predators
B.eusocial
C.caste
D.series-parallel sequence